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- Submitted-by: gwyn@smoke.brl.mil (Doug Gwyn)
-
- In article <14188@cs.utexas.edu> brnstnd@kramden.acf.nyu.edu (Dan Bernstein) writes:
- >It is a different issue. There are objective advantages to eliminating
- >/dev/tty, kernel controlling terminals, and POSIX sessions: the kernel
- >becomes noticeably smaller, the POSIX standard becomes several pages
- >thinner and a lot easier to implement, programmers no longer have to
- >worry about special system calls to manipulate the tty fd, non-orphaned
- >processes in orphaned process groups are not killed off unnecessarily,
- >etc.
-
- I think the fundamental problem is that P1003 leaned too much in the
- direction of "the system as seen by the user" as opposed to the system
- as seen by applications. Therefore, 1003.1 specified support for BSD-
- like job control (as an option, but NBS made it mandatory in the FIPS).
- But clearly BSD-like job control is a horrible kludge. In a superior
- environment with /proc and a good multiple-process-managing user
- interface, better (and definitely cleaner) implementations of "job
- control" are easy to accomplish. It is the single-tty-channel model
- that pretty much forced the signal-based design of the BSD approach,
- along with the extra kernel support (that never was gotten fully right
- in any implementation I've ever seen, although HP/UX may have been
- close).
-
- I agree with the sentiment that such kludgery should be phased out of
- the system interface standard.
-
- Volume-Number: Volume 22, Number 16
-
-